Table 4. Univariate ROC curves analysis.

HS vs AD				AD vs SMC
Elements	AUC	T-tests	Statistical Power (%)	Elements	AUC	T-tests	Statistical Power (%)
Mn/V	0.94044	4.78E-13	100	Mn/Ni	0.93137	2.08E-08	100
Cu/Mn	0.93456	8.87E-13	95	Cu/Mn	0.91422	4.44E-08	91
Mn/Sr	0.91838	1.18E-11	100	Mn/V	0.91176	3.63E-08	100
Mn/U	0.91691	4.72E-10	100	Ca/Mn	0.90074	1.78E-07	87
Ca/Mn	0.90882	7.58E-11	91	Co/Mn	0.89216	4.34E-07	91
Mn	0.89265	1.63E-10	100	Mn	0.89583	8.33E-08	100
V	0.82978	2.50E-07	94	Hg	0.80515	5.59E-05	91
Hg	0.77206	4.17E-05	88	Zn	0.78064	1.41E-04	96
Se	0.71618	2.35E-04	85	Se	0.77145	2.78E-04	91
Mo	0.70588	0.0018186	93	V	0.73897	0.0017877	84
Zn	0.70588	7.71E-04	71	Fe	0.73652	0.0045145	79
U	0.70515	4.98E-04	87
HS vs SMC				AD vs MCI
Elements	AUC	T-tests	Statistical Power (%)	Elements	AUC	T-tests	Statistical Power (%)
Sb/V	0.70781	0.0056067	88	Mn/Ni	0.77059	8.45E-04	94
Cu	0.70417	0.01083	83	Hg	0.74706	0.0035936	83
HS vs MCI				MCI vs SMC
Elements	AUC	T-tests	Statistical Power (%)	Elements	AUC	T-tests	Statistical Power (%)
Mn/V	0.885	1.30E-09	100	Mn/V	0.85417	3.83E-06	100
Se/V	0.87375	3.74E-09	100	Se/V	0.82083	7.29E-05	100
V/Zn	0.8725	7.31E-09	97	V/Zn	0.81667	2.28E-05	93
Mn/Mo	0.85125	1.92E-06	100	Mn	0.80417	2.12E-04	96
Sb/V	0.84125	6.16E-07	100	Se	0.79271	3.99E-04	99
V	0.80875	7.62E-06	99	Zn	0.7375	0.0060502	90
Mn	0.78	1.86E-05	84	V	0.72917	0.0065436	94
Se	0.7475	0.0013699	98
Mo	0.7225	0.013149	75